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Daily Practice Problems
Class 11 Physics
Laws of Motion

Question 1.

State Newton’s three laws of motion.

Question 2.

Give an expression for Newton’s second law of motion.

Question 3.

What do you understand by Impulse?

Question 4.

Give symbol, units and dimensions for static and kinetic friction.

Question 5.

What do you understand by friction?

Question 6.

A stone of mass 0.50 kg tied to the end of a string is whirled round in a circle of radius 2.0 m with a speed of 30 rev/min in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 300N?

Question 7.

A batsman deflects a ball by an angle of 300 without changing its initial speed which is equal to 72 km/h. What is the impulse imparted to the ball? (Mass of the ball 0.20 kg).

Question 8.

Eight five-rupee coins are put on top of each other on a table. Each coin has a mass m. Give the magnitude and direction of

1. The force on the fifth coin (counted from the bottom) due to all the coins on its top,
2. The reaction of the 4th coin on the 5th coin.

Question 9.

A shell of mass 0.025 kg is fired by a gun of mass 200 kg. If the muzzle speed of the shell is 75 m/s. What is the recoil speed of the gun?

Question 10.

Two masses 5 kg and 10 kg are connected at the two ends of a light inextensible string that goes over a frictionless pulley. Find the acceleration of the masses, and the tension in the string when the masses are released.

Question 11.

A truck starts from rest and accelerates uniformly at 3.0 m/s2. At t = 12 s, a stone is dropped by a girl standing on the top of the truck (8m high from the ground). What are the (a) velocity, and (b) acceleration of the stone at t = 13s.

Question 12.

A constant retarding force of 40N is applied to a body of mass 15 kg moving initially with a speed of 10 m/s. How long does the body take to stop?

Question 13.

Give the statement for “Law of conservation of Momentum”.

Question 14.

A circular racetrack of radius 500m is banked at an angle of 22.50 . If the coefficient of friction between the wheels of a race-car and the road is 0.15. What is the, (a) optimum speed of the race-car to avoid wear and tear on its tyres, and (b) maximum permissible speed to avoid slipping?

Question 15.

Determine the maximum acceleration of the train in which a box lying on its floor will remain stationary, given that the co-efficient of static friction between the box and the train’s floor is 0.2.

Question 16.

What is the unit and dimension of “Impulse”?

Question 17.

Give the magnitude and direction of the net force acting on a stone of mass 0.5 kg.

1. Just after it is dropped from the window of a stationary car.
2. Just after it is dropped from the window of a car accelerating with 2 m/s2.

Question 18.

Two billiard balls each of mass 0.08 kg moving in opposite directions with speed 5 m/s collide and rebound with the same speed. What is the impulse imparted to each ball due to the other?

Question 19.

A stream of water flowing horizontally with a speed of 12 m/s gushes out of a tube of cross-sectional area 2×10-2 m2 and hits a vertical wall nearby. What is the force exerted on the wall by the impart of water, assuming it does not rebound?

Question 20.

A bob of mass 0.2 kg hung from the ceiling of a room by a string 4 m long is set into oscillation. The speed of the bob at its mean position is 1.5 m/s. What is the trajectory of the bob if the string is cut, when the bob is (a) at one of its extreme positions, and (b) at its mean position?

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1. Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 11 Physics Laws of Motion you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
2. Understanding Deeper Concepts: When you encounter problems related to a theoretical concept that you learned in Class 11 Physics Laws of Motion NCERT Chapter 4, you are forced to delve deeper into its intricacies. This deeper understanding enhances your comprehension of the subject and strengthens your grasp of the underlying principles.
3. Critical Thinking: Problem-solving encourages critical thinking and analytical skills. It requires you to analyze the problem, identify relevant information, and devise a logical solution. This process sharpens your mind and improves your ability to approach complex challenges effectively.
4. Retention and Recall: Actively engaging in problem-solving reinforces your memory and improves long-term retention. Applying the concepts learned in Laws of Motion Class 11 Physics in practical scenarios helps you remember them better than passive reading or memorization.
5. Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Laws of Motion Class 11 Physics Notes on LearnoHub.com
6. Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Laws of Motion. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
7. Preparation for Exams and Challenges: Many exams, especially in science, mathematics, and engineering, involve problem-solving tasks. Regular practice in problem-solving prepares you to face these exams with confidence and perform well. It is also advised to take tests on Laws of Motion Class 11 Physics Online Tests at LearnoHub.com.
8. Enhancing Creativity: Problem-solving often requires thinking outside the box and exploring various approaches. This fosters creativity and innovation, enabling you to come up with novel solutions to different problems.
9. Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
10. Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Laws of Motion Class 11 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 11 Physics Laws of Motion NCERT Chapter 4

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 11 Physics Laws of Motion NCERT Chapter 4 useful.

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